How do I migrate running cloudlet to different vm in same host

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Hello,
I am working on cloudsim where 10 Cloudlets are being executed in 4 Vms. i am stuck in a point where i need solution on "How can i move a running cloudlet from one vm to any other free Vm if any of the four Vm completed its assigned cloudlets".If problem specification is not clear then please let me know

What I have tried:

Currently we are trying to build an algorithm which needs to enhance overall makespan(total execution time of cloudlets or tasks). We assigned cloudlets to Vm in shortest job first manner and created a loop for all Vms. when any Vm finishes all the cloudlets assigned to it then we check for cloudlets whether they are currently executing on any other Vm, if any found, we want to migrate it to free Vm.(We are not able to execute this step) Please help us.